US6242801B1 - Semiconductor device - Google Patents
Semiconductor device Download PDFInfo
- Publication number
- US6242801B1 US6242801B1 US08/750,974 US75097497A US6242801B1 US 6242801 B1 US6242801 B1 US 6242801B1 US 75097497 A US75097497 A US 75097497A US 6242801 B1 US6242801 B1 US 6242801B1
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- H01L24/42—Wire connectors; Manufacturing methods related thereto
- H01L24/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L24/49—Structure, shape, material or disposition of the wire connectors after the connecting process of a plurality of wire connectors
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- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/495—Lead-frames or other flat leads
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Definitions
- the present invention relates to a semiconductor device in which a semiconductor element is mounted on an island, and especially to a semiconductor device in which an island has a characteristic shape.
- a semiconductor device has a structure as described below.
- a photodetector device having a semiconductor element such as a photodiode is taken as an example.
- the photodetector device is composed of a common lead 31 having at one end an approximately square-shaped island 31 a , specific leads 32 and 33 formed on both sides of and approximately parallel with the common lead 31 , a semiconductor element 34 die-bonded on the island 31 a , a plurality of wires 35 made of gold or other for electrically connecting the semiconductor element 34 to the top surface of the island 31 a and to the specific leads 32 and 33 by wire bonding, and an approximately square-shaped resin seal 36 made of epoxy resin for sealing in the semiconductor element 34 and the wires 35 (the resin seal 36 actually is opaque, though it is shown as transparent in FIG. 4 ).
- a plurality of projection-like electrode pads made of aluminum or other.
- bonded wires 35 of which four are, at the other end, bonded on the top surface of the island 31 a and two are, at the other end, bonded on the specific leads 32 and 33 , respectively.
- the first four wires are electrically connected to the island 31 a so as to be grounded, and thus serve to adjust the resistance against a current flowing between the specific leads 32 and 33 .
- the resin seal 36 is so formed as to seal in the semiconductor element 34 and the wires 35 as shown in FIG. 5 by use of a resin-forming mold (not shown).
- the resin seal 36 has, at its portion approximately above the semiconductor device 34 , a hemispherical condenser lens 37 for leading light from outside to the semiconductor element 34 .
- this photodetector has been suffering from a following problem.
- the above resin seal 36 is heated to seal in the semiconductor element 34 and the wires 35 , and thereafter, as the resin seal 36 cools down, it develops contraction stress inside itself. This causes the wires 35 to be pulled together with the resin, of which the resin seal 36 is made, in the direction of the inward contraction of the resin. On the other hand, the island 31 a , on which one end of each wire 35 is stitch-bonded, contracts far less than the resin seal 36 because of their different thermal expansion coefficients.
- the wires 35 are subjected to force that pulls them in the direction of the contraction of the resin and that tends to tear the ends of the wires 35 off the island 31 a , and eventually the wires 35 are broken as shown in FIG. 6 . Moreover, the same can be caused even by variations in ambient temperature.
- An object of the present invention is to provide a highly reliable semiconductor device that is substantially free from wire breakage.
- a semiconductor device comprising a lead terminal having an island at one end, a semiconductor element whose bottom surface is connected to the island, one or more wires that connect the top surface of the semiconductor element to the island, and a resin seal that seals in the semiconductor element and the wires
- said island has a cut formed between a section on which said semiconductor element is mounted and a section on which said wires are bonded.
- the cut is so formed as to extend below all the wires.
- FIG. 1 is a partly-removed plan view showing a photodetector as an example of the semiconductor device of the present invention
- FIGS. 2A, 2 B, 2 C, 2 D and 2 E are partly-removed plan views each showing a modified example of the semiconductor device of the present invention
- FIG. 3 is a partly-removed plan view showing another modified example of the semiconductor device of the present invention.
- FIG. 4 is a partly-removed plan view showing a conventional semiconductor device
- FIG. 5 is a perspective view of the principal portion of the conventional semiconductor device.
- FIG. 6 is a diagram explaining a state of wire breakage in the conventional semiconductor device.
- FIGS. 1 and 2A, 2 B, 2 C, 2 D and 2 E a photodetector device having a semiconductor element including a photodiode element
- a photodiode element a photodetector device having a semiconductor element including a photodiode element
- the semiconductor device comprises a common lead 1 (lead terminal) having at one end an approximately square-shaped island 1 a , specific leads 2 a and 2 b formed on both sides of and approximately parallel with the common lead 1 , a photodiode element 3 that is die-bonded on the island 1 a , a plurality of wires 4 made of gold or other for electrically connecting the photodiode element 3 to the top surface of the island 1 a and to the specific leads 2 a and 2 b by wire bonding, and an approximately square-shaped resin seal 5 made of epoxy resin for sealing in the photodiode element 3 and the wires 4 (the resin seal 5 actually is opaque, though it is shown as transparent in FIG. 1 ).
- a cut 1 b is formed between the section on which the photodiode element 3 is mounted and the section on which the wires 4 are bonded.
- This cut 1 b is formed along one side (the side where stitch-bonding of the wires 4 is present in the figure) of the photodiode element 3 .
- the length A of the cut 1 b is about 1.9 mm, and the width B of the island is about 2.3 mm. Therefore, the length A of the cut 1 b is approximately 80% of the width B of the island.
- the width C of the cut 1 b is about 0.4 mm.
- the wires 4 are individually bonded at one end. Of these wires 4 , four are, at the other end, stitch-bonded on the top surface of the island 1 a , with the wires crossing over the cut 1 b , and two are, at the other end, stitch-bonded on the specific leads 2 a and 2 b , respectively.
- the resin seal 5 is formed by molding epoxy resin, which is a thermosetting resin, into a shape as described earlier and as shown in FIG. 5 by use of a conventional resin-forming mold.
- the resin seal 5 is formed, for example, by applying heat-molten epoxy resin over the photodiode element 3 and the wires 4 to seal them in, and then letting the resin cool down to room temperature.
- the island 1 a having a cut 1 b formed between the section on which the photodiode element 3 is mounted and the section on which the wires 4 are bonded as described earlier, easily deforms in the direction (shown by arrows in FIG. 1) in which those two sections come closer to or apart from each other about the cut 1 b . Accordingly, the island 1 a allows its portion around the cut 1 b to deform easily with the inward contraction of the epoxy resin.
- the cut 1 b is so formed as to extend below all the wires 4 so that the island 1 a is in a form to deform readily in the direction in which its two sections come close to or apart from each other about the cut 1 b . Accordingly, the island 1 a allows its portion around the cut 1 b (including the portion on which the wires 4 are bonded) to deform easily with the contraction of the resin. As a result, the possibility of wire breakage is reduced significantly.
- the cut 1 b is formed, as shown in FIG. 1, along one side of the square-shaped photodiode element 3 so as to be parallel with that side.
- FIG. 2A shows a cut pattern that is substantially the same as that shown in FIGS. 1, and 2 B, 2 C, 2 D and 2 E show other cut patterns with which the object of the present invention is achieved.
- the cut 1 b can be formed in any shape and in any position as long as the wires 4 cross over it.
- the present invention can be invariably applied to semiconductor devices having one or more wires.
- the length and width of the cut 1 b are not limited to particular values as shown in the above embodiment, and it is also possible to form more than one cuts 1 b.
- the cut 1 b is formed with one end open, i.e. like a notch, in the above embodiment, it may be formed without an open end, i.e. as a through hole 6 , as shown in FIG. 3 .
- the through hole 6 needs to be large enough to allow the island to deform easily with the contraction of the epoxy resin.
- the diameter of the through hole 6 (or the major length of the hole, if it is elongated) needs to be close to the width of the island.
- an island has a cut formed between a section on which a semiconductor element is mounted and a section on which wires are bonded.
- the semiconductor device is formed, for example, by applying heat-molten thermosetting resin over the semiconductor element and the wires so that they are sealed in in a resin seal.
- the resin as it cools down after curing, develops contraction strain inside itself. This causes the wires as well as the resin to be subjected to force that pulls them inward in the direction of the contraction.
- the island has, as described above, a cut formed between the section on which the semiconductor element is mounted and the section on which the wires are bonded, so that the island is in a form to deform readily in the direction in which its two sections come close to or away from each other about the cut. Accordingly, the island allows its portion around the cut to deform easily with the inward contraction of the resin.
- the island 1 a is also pulled in the same direction in which the epoxy resin contracts.
- the possibility of breakage of the wires at their ends bonded on the island 1 a can be reduced significantly.
- the present invention can be usefully applied to semiconductor devices including a photodiode element or any other type of semiconductor element, and is especially suitable for semiconductor devices whose semiconductor elements, lead terminals, and wires connecting these are resin-molded.
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Light Receiving Elements (AREA)
- Structures Or Materials For Encapsulating Or Coating Semiconductor Devices Or Solid State Devices (AREA)
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Abstract
Description
Claims (11)
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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JP11330395 | 1995-05-11 | ||
JP7-113303 | 1995-05-11 | ||
JP10572596A JP3907743B2 (en) | 1995-05-11 | 1996-04-25 | Semiconductor device |
JP8-105725 | 1996-04-25 | ||
PCT/JP1996/001267 WO1996036074A1 (en) | 1995-05-11 | 1996-05-10 | Semiconductor device |
Publications (1)
Publication Number | Publication Date |
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US6242801B1 true US6242801B1 (en) | 2001-06-05 |
Family
ID=26445967
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US08/750,974 Expired - Fee Related US6242801B1 (en) | 1995-05-11 | 1996-05-10 | Semiconductor device |
Country Status (8)
Country | Link |
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US (1) | US6242801B1 (en) |
EP (1) | EP0771027B1 (en) |
JP (1) | JP3907743B2 (en) |
KR (1) | KR100370550B1 (en) |
CN (1) | CN1134073C (en) |
DE (1) | DE69635334T2 (en) |
TW (1) | TW301046B (en) |
WO (1) | WO1996036074A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6344689B1 (en) * | 1999-10-07 | 2002-02-05 | Rohm Co., Ltd. | Optical semiconductor device for surface mounting |
US6525418B2 (en) * | 2001-05-30 | 2003-02-25 | Kabushiki Kaisha Moric | Semiconductor device |
US6894371B2 (en) * | 2002-02-27 | 2005-05-17 | Sanyo Electric Co., Ltd. | Semiconductor device |
Citations (22)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS52129379A (en) | 1976-04-23 | 1977-10-29 | Hitachi Ltd | Plastic molded semiconductor device |
EP0026788A1 (en) | 1979-03-09 | 1981-04-15 | Fujitsu Limited | Semiconductor device |
JPS6234154A (en) | 1985-08-08 | 1987-02-14 | Oji Paper Co Ltd | Support for photographic printing paper |
JPS6353983A (en) * | 1986-08-22 | 1988-03-08 | Matsushita Electric Works Ltd | Photocoupler |
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JPH01123356U (en) * | 1988-02-16 | 1989-08-22 |
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1996
- 1996-04-25 JP JP10572596A patent/JP3907743B2/en not_active Expired - Fee Related
- 1996-05-10 US US08/750,974 patent/US6242801B1/en not_active Expired - Fee Related
- 1996-05-10 EP EP96913744A patent/EP0771027B1/en not_active Expired - Lifetime
- 1996-05-10 DE DE69635334T patent/DE69635334T2/en not_active Expired - Fee Related
- 1996-05-10 CN CNB96190481XA patent/CN1134073C/en not_active Expired - Fee Related
- 1996-05-10 KR KR1019970700116A patent/KR100370550B1/en not_active IP Right Cessation
- 1996-05-10 WO PCT/JP1996/001267 patent/WO1996036074A1/en active IP Right Grant
- 1996-05-11 TW TW085105585A patent/TW301046B/zh active
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US5563441A (en) * | 1992-12-11 | 1996-10-08 | Mitsubishi Denki Kabushiki Kaisha | Lead frame assembly including a semiconductor device and a resistance wire |
US5459350A (en) * | 1993-01-13 | 1995-10-17 | Mitsubishi Denki Kabushiki Kaisha | Resin sealed type semiconductor device |
US5397905A (en) * | 1993-02-16 | 1995-03-14 | Fuji Electric Co., Ltd. | Power semiconductor device having an insulated gate field effect transistor and a bipolar transistor |
US5704593A (en) * | 1993-09-20 | 1998-01-06 | Nec Corporation | Film carrier tape for semiconductor package and semiconductor device employing the same |
US5598038A (en) * | 1993-11-11 | 1997-01-28 | Nec Corporation | Resin encapsulated semiconductor device |
US5661342A (en) * | 1994-11-09 | 1997-08-26 | Mitsubishi Denki Kabushiki Kaisha | Semiconductor device with heat sink including positioning pins |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6344689B1 (en) * | 1999-10-07 | 2002-02-05 | Rohm Co., Ltd. | Optical semiconductor device for surface mounting |
US6525418B2 (en) * | 2001-05-30 | 2003-02-25 | Kabushiki Kaisha Moric | Semiconductor device |
US6894371B2 (en) * | 2002-02-27 | 2005-05-17 | Sanyo Electric Co., Ltd. | Semiconductor device |
Also Published As
Publication number | Publication date |
---|---|
EP0771027A4 (en) | 2000-01-05 |
JPH0927577A (en) | 1997-01-28 |
DE69635334D1 (en) | 2005-12-01 |
EP0771027B1 (en) | 2005-10-26 |
EP0771027A1 (en) | 1997-05-02 |
TW301046B (en) | 1997-03-21 |
JP3907743B2 (en) | 2007-04-18 |
CN1154180A (en) | 1997-07-09 |
KR100370550B1 (en) | 2003-07-18 |
DE69635334T2 (en) | 2006-07-20 |
KR970705180A (en) | 1997-09-06 |
WO1996036074A1 (en) | 1996-11-14 |
CN1134073C (en) | 2004-01-07 |
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